package com.atguigu.gulimall.product.service.impl;

import com.atguigu.gulimall.product.entity.CategoryBrandRelationEntity;
import com.atguigu.gulimall.product.service.CategoryBrandRelationService;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.transaction.annotation.Transactional;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

//    @Autowired
//    CategoryDao categoryDao;

    @Autowired
    private CategoryBrandRelationService categoryBrandRelationService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {

        //1.查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        //2.组装分类父子结构
        //2.1)找到所有一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
                categoryEntity.getParentCid() == 0
        ).map(menu -> {
            menu.setChildren(getChildrens(menu, entities));
            return menu;
        }).sorted((menu1, menu2) -> {
            return menu1.getSort() - menu2.getSort();
        }).collect(Collectors.toList());

        return level1Menus;
    }

    /**
     * 查找当前菜单的所有子菜单
     *
     * @param root
     * @param all
     * @return
     */
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {

        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map(categoryEntity -> {
            //1、递归查找子菜单
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1, menu2) -> {
            //2、分类排序
            return (menu1.getSort() == null ? 0 : menu1.getSort()) - (menu2.getSort() == null ? 0 : menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }

    @Override
    public void removeCategoryByIds(List<Long> asList) {
        //TODO 1、检查是否被别的地方引用

        //使用逻辑删除
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {

        List<Long> paths = new ArrayList<Long>();
        List<Long> parentPath = findParentPath(catelogId,paths);

        Collections.reverse(parentPath);

        return parentPath.toArray(new Long[parentPath.size()]);
    }

    @Transactional(rollbackFor = Exception.class)
    @Override
    public void updateDetail(CategoryEntity category) {

        //1、更新分类信息
        this.updateById(category);
        //2、判断分类名称是否为空，更新关联类数据
        if(StringUtils.isNotEmpty(category.getName())){
            categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
            //TODO 更新其他关联
        }

    }

    /**
     * 递归查询分类的父节点集合
     * @param catelogId
     * @param paths
     * @return
     */
    private List<Long> findParentPath(Long catelogId, List<Long> paths) {
        //1、收集当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid() != 0){
            findParentPath(byId.getParentCid(),paths);
        }

        return paths;
    }
}